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Musashi Exerts Control of Gonadotrope Target mRNA Translation During the Mouse Estrous Cycle.

Authors :
Moreira ARS
Lim J
Urbaniak A
Banik J
Bronson K
Lagasse A
Hardy L
Haney A
Allensworth M
Miles TK
Gies A
Byrum SD
Wilczynska A
Boehm U
Kharas M
Lengner C
MacNicol MC
Childs GV
MacNicol AM
Odle AK
Source :
Endocrinology [Endocrinology] 2023 Aug 01; Vol. 164 (9).
Publication Year :
2023

Abstract

The anterior pituitary controls key biological processes, including growth, metabolism, reproduction, and stress responses through distinct cell types that each secrete specific hormones. The anterior pituitary cells show a remarkable level of cell type plasticity that mediates the shifts in hormone-producing cell populations that are required to meet organismal needs. The molecular mechanisms underlying pituitary cell plasticity are not well understood. Recent work has implicated the pituitary stem cell populations and specifically, the mRNA binding proteins of the Musashi family in control of pituitary cell type identity. In this study we have identified the target mRNAs that mediate Musashi function in the adult mouse pituitary and demonstrate the requirement for Musashi function in vivo. Using Musashi RNA immunoprecipitation, we identify a cohort of 1184 mRNAs that show specific Musashi binding. Identified Musashi targets include the Gnrhr mRNA, which encodes the gonadotropin-releasing hormone receptor (GnRHR), and the Fshb mRNA, encoding follicle-stimulating hormone (FSH). Reporter assays reveal that Musashi functions to exert repression of translation of the Fshb mRNA, in addition to the previously observed repression of the Gnrhr mRNA. Importantly, mice engineered to lack Musashi in gonadotropes demonstrate a failure to repress translation of the endogenous Gnrhr and Fshb mRNAs during the estrous cycle and display a significant heterogeneity in litter sizes. The range of identified target mRNAs suggests that, in addition to these key gonadotrope proteins, Musashi may exert broad regulatory control over the pituitary proteome in a cell type-specific manner.<br /> (© The Author(s) 2023. Published by Oxford University Press on behalf of the Endocrine Society. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)

Details

Language :
English
ISSN :
1945-7170
Volume :
164
Issue :
9
Database :
MEDLINE
Journal :
Endocrinology
Publication Type :
Academic Journal
Accession number :
37477898
Full Text :
https://doi.org/10.1210/endocr/bqad113